Instrument

Abstract

A measuring apparatus in which the necessity of a light conductor for illuminating the front panel can be eliminated and cost reduction and slimming is realized, comprising: a circuit board 1 ; an instrument body 3 disposed on the circuit board 1 and including a drive shaft 2 extending forward; a pointer 4 to be fitted on the tip side of the drive shaft 2 ; a front panel 5 disposed between the pointer 4 and the circuit board 1 for illuminating at least the display portion 52 ; a light source 6 disposed in front of the circuit board 1 on the side where the drive shaft 2 resides with respect to the display portion 52 ; a reflector 7 to be disposed between the front panel 5 and the circuit board 1 ; and the circuit board 1 including a first reflecting portion 75 facing to the light source 6 for reflecting the illumination from the light source 6 toward the outer periphery, and a second reflecting portion 77 extending outward with an appropriate space interposed between itself and the front panel 5 so as to surround the light source 6 for reflecting the illumination toward the front panel 5.

What is claimed is:  
     
       1. An instrument apparatus as set forth in  claim 1 , characterized in that said instrument body is disposed behind said circuit board in such a manner that the drive shaft pass through said circuit board, in that said pointer is constructed so as to emit a light upon reception of the light supply from the center of rotation hereof, in that said front panel is formed with a through hole for exposing the center of rotation of said pointer, in that said light source is disposed at the position corresponding to said through hole, and in that said reflector includes an opening for allowing said illumination to pass toward the center of rotation of said pointer at the position corresponding to said through hole. 
     
     
       2. An instrument apparatus comprising: a circuit board; an instrument body disposed behind the circuit board and provided with a drive shaft extending through said circuit board to the front; a pointer fitted on the tip of said drive shaft for emitting a light upon reception of the light supply from the center of rotation; a front panel disposed between the pointer and said circuit board, and including a through hole for exposing the display portion corresponding to said pointer and the center of rotation of said pointer; a first light source disposed in front of said circuit board at the position corresponding to said through hole for illuminating said pointer; a second light source disposed in front of said circuit board, which is the outside of the first light source and the side where said drive shaft resides with respect to said display portion for illuminating said display portion; and a reflector disposed between said front panel and said circuit board, characterized in that said reflector includes an opening for allowing the illumination from said first light source to pass toward the center of rotation of said pointer at the position corresponding to said through hole, a first reflecting portion located outside of the opening to face to said second light source for reflecting the illumination from said second light source toward the outer periphery, and a second reflecting portion extending toward outside with an appropriate airspace interposed between itself and said front panel so as to surround said second light source for reflecting the illumination from said second light source toward said front panel. 
     
     
       3. An instrument apparatus as set forth in  claim 2 , characterized in that said reflector includes a partition surrounding said opening and extending in the direction of the axis of said drive shaft for separating said first light source and said second light source. 
     
     
       4. An instrument apparatus as set forth in  claim 3 , characterized in that said partition is provided with said first reflecting portion. 
     
     
       5. An instrument apparatus as set forth in  claim 1 , characterized in that said first reflecting portion is formed of an inclined surface or an inclined curved surface inclined by a prescribed angle with respect to said front panel. 
     
     
       6. An instrument apparatus as set forth in  claim 5 , characterized in that said inclined surface of said inclined curved surface is formed into a conical shape which surrounds said drive shaft. 
     
     
       7. An instrument apparatus as set forth in  claim 1 , characterized in that said second reflecting portion is formed of an inclined surface or an inclined curved surface that approaches to said front panel with the distance from the center. 
     
     
       8. An instrument apparatus as set forth in  claim 7 , characterized in that said inclined surface or said inclined curved surface is formed in such a manner that the inclined angle with respect to the front panel increase with the distance from the center. 
     
     
       9. An instrument apparatus as set forth in  claim 1 , characterized in that said first reflecting portion is formed separately from said reflector. 
     
     
       10. An instrument apparatus as set forth in  claim 2 , characterized in that a plurality of said first and second light sources are disposed on the concentric circles with said drive shaft as a center. 
     
     
       11. An instrument apparatus as set forth in  claim 2 , characterized in that the first light source and the second light source are different in color. 
     
     
       12. An instrument apparatus as set forth in  claim 1 , characterized in that said first reflecting portion is formed with a reflecting film. 
     
     
       13. An instrument apparatus as set forth in  claim 1 , characterized in that said front panel has a reflecting film facing to said second reflecting portion. 
     
     
       14. An instrument apparatus as set forth in  claim 13 , characterized in that said reflecting film is formed while avoiding said display portion. 
     
     
       15. An instrument apparatus as set forth in  claim 12 , characterized in that said reflecting film is in metallic color. 
     
     
       16. An instrument apparatus as set forth in  claim 15 , characterized in that the surface of said reflecting film is mirror-finished. 
     
     
       17. An instrument apparatus as set forth in  claim 15 , characterized in that said metallic color is silver. 
     
     
       18. An instrument apparatus as set forth in  claim 1 , characterized in that said instrument body is disposed behind said circuit board in such a manner that said drive shaft passes through said circuit board and extends forward. 
     
     
       19. An instrument apparatus as set forth in  claim 1 , characterized in that said reflector is formed of a whitish synthetic resin material. 
     
     
       20. An instrument apparatus as set forth in  claim 1 , characterized in that the wall surface of said reflector is formed into a glossy surface. 
     
     
       21. An instrument apparatus as set forth in  claim 1 , characterized in that said light source or said first and said second light sources comprise a light-emitting diode.